<html>
<head>
    <title>GH1316 form</title>
</head>
<body>
<form action="/1316" method="post" enctype="multipart/form-data">

    <input name="files1" type="file" multiple />
    <input name="files2" type="file" multiple />

    <button type="submit">Submit</button>
</form>
</body>
</html>